如何使用循环生成随机数学题直到用户答错

import java.util.Random;
import java.util.Scanner;

public class MathQuiz {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        Random random = new Random();
        int score = 0;

        System.out.println("欢迎来到数学小测验！");

        while (true) {
            // 生成随机数
            int num1 = random.nextInt(9) + 2; // 2-10
            int num2 = random.nextInt(num1 - 1) + 1; // 1 - (num1 -1)
            //生成随机运算符
            int operatorIndex = random.nextInt(4); // 0-3, 对应 +, -, *, /
            String operator = "";
            double correctAnswer = 0;

            switch (operatorIndex) {
                case 0:
                    operator = "+";
                    correctAnswer = num1 + num2;
                    break;
                case 1:
                    operator = "-";
                    correctAnswer = num1 - num2;
                    break;
                case 2:
                    operator = "*";
                    correctAnswer = num1 * num2;
                    break;
                case 3:
                    operator = "/";
                    operator = "/";
                    if (num2 == 0) {
                        num2 = 1; // 避免除数为 0
                    }
                    correctAnswer = (double) num1 / num2;
                    break;
            }

            // 打印题目
            System.out.println("请计算: " + num1 + " " + operator + " " + num2 + " = ?");

            // 获取用户答案
            double userAnswer;
            try {
                userAnswer = scanner.nextDouble();
            } catch (java.util.InputMismatchException e) {
                System.out.println("输入格式错误，请输入数字。");
                scanner.next(); // 清空错误输入
                continue; // 跳过本次循环，重新开始
            }

            // 检查答案
            if (Math.abs(userAnswer - correctAnswer) < 0.001) { // 考虑浮点数精度问题
                System.out.println("回答正确！");
                score++;
            } else {
                System.out.println("回答错误。正确答案是: " + correctAnswer);
                break; // 结束循环
            }
        }

        System.out.println("游戏结束！您的最终得分是: " + score);
        scanner.close();
    }
}